I dont know who actually makes the stock, Ruger or some aftermarket manf. What i do know is i LIKE the stock.
Ive got a Magpul PRS stock on my psudo SPR. And a Luth MBA1stock on my suppressed 308 bolt gun.
The Ruger stock is EVERY bit as good as either one of those. If it is an aftermarket company manufacturing that stock...they are missing the boat by not offering it as a solo part.